Abstract:

Objective: The main purpose of this paper is to study the reasons that seven plants, including Metasequoia glyptostroboides, Liquidambar formosana, Broussonetia papyrifera, Populus tomentosa, Chaenomeles sinensis, Liriodendron chinense and Fraxinus chinensis do not become the hosts of Corythucha ciliata although the volatiles from the leaves of these seven plants have a significant attracting effect on C. ciliata adults, soas to provide a basis information for the use of non-host plants by tree species arrangement or their extracts to prevent and control C. ciliate. Method: The crude extracts from the leaves of the seven non host plants were obtained by grinding and filtration. The crude extracts were fed to the adults of C. ciliata to determine the impact on their survival. The crude extracts and dilutions of different volume fraction were applied to the leaves of Platanus acerifolia to determine the repellent activity against the adults of C. ciliata. Result: The survival status of C. ciliata adults fed with crude leaf extracts of 7 non-host plants was significantly lower than the control (water), and the median lethal time, 99% lethal time and average survival time were extremely significant shorter than those of C.ciliata adults treated with water, especially C. sinensis. The crude extracts from the leaves of the seven non-host plants all have repellent effects on C. ciliata adults. The highest repellent rate was B. papyrifera (74.84%), followed by F. chinensis (70.74%), L. formosana (53.90%), C. sinensis (53.33%), M. glyptostroboides (51.66%), P. tomentosa (49.47%) and L. chinense (43.19%). When the crude extracts were diluted, the repellent effects decreased, but the effects did not decrease unidirectionally with the decrease in volume fraction. Conclusion: That the crude extracts of these seven non-plant which have an attractive olfactory effect, contain substances that are toxic or and repellent to the adults of C. ciliata, may be one of the reasons why these plants are not used by C. ciliata. Among the seven plants, the extracts of B. papyrifera had the strongest repelling effect and the extracts of C. sinensis have the greatest toxicity to C. ciliata. The possible applications of the two plants in the control of C. ciliata can be studied further.

Key words: Corythucha ciliata, non-host plant, biological activity, survival impact, repellent activity